[Android] Enable platform mode on more perf bots.

scripts/slave/recipes/android/perf.expected/test_failure.json

 [
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
       "--master",
       "chromium.perf",
       "--builder",
       "Android Nexus5 Perf (1)",
@@ skipping 483 matching lines @@
       "--verbose",
       "--steps",
       "{\"steps\": {\"blink_perf.all.exact\": {\"cmd\": \"/usr/bin/python /path/to/run_benchmark --a=1 -v --b=2\", \"device_affinity\": 1, \"perf_dashboard_id\": \"blink_perf.all\"}, \"blink_perf.all.release\": {\"cmd\": \"/usr/bin/python /path/to/run_benchmark --a=1 -v --b=2\", \"device_affinity\": 0, \"perf_dashboard_id\": \"blink_perf.all\"}, \"blink_perf.dom\": {\"cmd\": \"/path/to/run_benchmark -v --upload-results blink_perf.dom\", \"device_affinity\": 1, \"perf_dashboard_id\": \"blink_perf.dom\"}}, \"version\": 2}",
       "--blacklist-file",
       "[SLAVE_BUILD]/src/out/bad_devices.json",
       "--collect-chartjson-data",
       "--max-battery-temp",
       "350",
       "--known-devices-file",
       "[HOME]/.android/known_devices.json",
+      "--enable-platform-mode",
       "--adb-path",
       "[SLAVE_BUILD]/src/third_party/android_tools/sdk/platform-tools/adb"
     ],
     "cwd": "[SLAVE_BUILD]/src",
     "env": {
       "CHROMIUM_OUTPUT_DIR": "[SLAVE_BUILD]/src/out/Release",
       "GOMA_SERVICE_ACCOUNT_JSON_FILE": "/creds/service_accounts/service-account-goma-client.json",
       "PATH": "[SLAVE_BUILD]/src/third_party/android_tools/sdk/platform-tools:[SLAVE_BUILD]/src/build/android:%(PATH)s"
     },
     "name": "Sharded Perf Tests"
@@ skipping 61 matching lines @@
       "--builder-name=Android Nexus5 Perf (1)",
       "--slave-name=slavename",
       "--build-number=571",
       "--run-python-script",
       "[SLAVE_BUILD]/src/build/android/test_runner.py",
       "perf",
       "--print-step",
       "page_cycler.foo",
       "--verbose",
       "--blacklist-file",
-      "[SLAVE_BUILD]/src/out/bad_devices.json"
+      "[SLAVE_BUILD]/src/out/bad_devices.json",
+      "--enable-platform-mode"
     ],
     "env": {
       "CHROMIUM_OUTPUT_DIR": "[SLAVE_BUILD]/src/out/Release",
       "GOMA_SERVICE_ACCOUNT_JSON_FILE": "/creds/service_accounts/service-account-goma-client.json",
       "PATH": "[SLAVE_BUILD]/src/third_party/android_tools/sdk/platform-tools:[SLAVE_BUILD]/src/build/android:%(PATH)s"
     },
     "name": "page_cycler.foo",
     "~followup_annotations": [
       "@@@STEP_TEXT@<br/>Device Affinity: 0<br/>@@@",
       "@@@STEP_LOG_LINE@json.output@[]@@@",
@@ skipping 26 matching lines @@
       "--builder-name=Android Nexus5 Perf (1)",
       "--slave-name=slavename",
       "--build-number=571",
       "--run-python-script",
       "[SLAVE_BUILD]/src/build/android/test_runner.py",
       "perf",
       "--print-step",
       "perf_test.foo",
       "--verbose",
       "--blacklist-file",
-      "[SLAVE_BUILD]/src/out/bad_devices.json"
+      "[SLAVE_BUILD]/src/out/bad_devices.json",
+      "--enable-platform-mode"
     ],
     "env": {
       "CHROMIUM_OUTPUT_DIR": "[SLAVE_BUILD]/src/out/Release",
       "GOMA_SERVICE_ACCOUNT_JSON_FILE": "/creds/service_accounts/service-account-goma-client.json",
       "PATH": "[SLAVE_BUILD]/src/third_party/android_tools/sdk/platform-tools:[SLAVE_BUILD]/src/build/android:%(PATH)s"
     },
     "name": "perf_test.foo",
     "~followup_annotations": [
       "step returned non-zero exit code: 1",
       "@@@STEP_TEXT@<br/>Device Affinity: 0<br/>@@@",
@@ skipping 104 matching lines @@
       "@@@STEP_LOG_END@python.inline@@@"
     ]
   },
   {
     "name": "$result",
     "reason": "sharded perf tests failed [StepFailure(\"Step('perf_test.foo') failed with return_code 1\",)]",
     "recipe_result": null,
     "status_code": 1
   }
 ]